What you watch on TV and at the movies has an effect on you and your wife. For example: if you and your wife spend time in front of the TV watching violent shows, your wife is far less likely to be in the mood for romance later. In fact, one study showed that two thirds of women surveyed were not interested in snuggling in bed - let alone anything more - after watching a violent show.
Save the scary and violent movies to watch with the guys - and spend more time watching comedy or drama with your wife. Of course, you could shock her and watch a romantic "chick flick" together. Be sure to pull her close and let her snuggle up to you. After watching a comedy or romance movie, she will be much more likely to be romantic later.
Perhaps more importantly: notice how you are affected by what you watch. For example, watching images of sexy women may be enjoyable, but it begins to set a standard in your mind. In your mind you will find yourself automatically comparing your wife to those air brushed, computer enhanced, perfectly lighted, $1000 hair-do, team of makeup artist-worked-on-her-for-two-hours super hot sexy girls on film and in magazines. Talk about setting up unrealistic expectations!
When your mind sees your wife compared to unreal (literally unreal) beauty, you may find yourself wondering "what if" or "I wish". The fact is your wife can tell when you're looking at her and thinking about ways she could change by comparing her to someone else. How can she tell? Most women already compare themselves to other women. They do it constantly and they can tell when you do it. She can feel you comparing her to others in your mind, validating her insecurities about how she looks. This is nothing but destructive to her libido and self image. This does not help your wife feel sexy, loved or wanted.
How do you make her feel sexy, loved and wanted? When you look at her, look only at her. Don't be thinking about someone else. Let her know you accept her for her true beauty, not the unrealistic beauty put forth by the media and movie industry. Accept her 100%. Focus on her - don't drift. Be with her 100%. She is your wife. Those other impossible beauties are not. Make your wife happy and secure. She will reciprocate, trust me.